//
//  NSNull+NSString.h
//  TravelGuideMdd
//
//  Created by 陈曦 on 13-8-23.
//  Copyright (c) 2013年 mafengwo.com. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface NSNull(NSString)

- (NSUInteger)length;
- (BOOL)isEqualToString:(NSString*)aString;
- (id)objectForKey:(NSString*)aString;

@end
